Misfires and lean condition
#1
Misfires and lean condition
Hello guys, I hope someone can shed some light into this. My procharged 2005 FX4 gets random misfires in first gear under full throttle at around 4300 RPM. During the misfires it gets a lean condition (13-13.5 A/F). I have changed fuel filters and cleaned all electrical connections of the COP´s. Could a COP have gone bad?? The misfires randomly change from cylinder 3 to cylinder 7. Will a misfire make the combustion go lean?? Could the belt be slipping??
Also, has anyone tried the granatelly high performance COP´s ??
Thanks for the info. This is a great forum ĦĦĦĦ
Also, has anyone tried the granatelly high performance COP´s ??
Thanks for the info. This is a great forum ĦĦĦĦ
#2
Originally Posted by flavio marco
Hello guys, I hope someone can shed some light into this. My procharged 2005 FX4 gets random misfires in first gear under full throttle at around 4300 RPM. During the misfires it gets a lean condition (13-13.5 A/F). I have changed fuel filters and cleaned all electrical connections of the COP´s. Could a COP have gone bad?? The misfires randomly change from cylinder 3 to cylinder 7. Will a misfire make the combustion go lean?? Could the belt be slipping??
Also, has anyone tried the granatelly high performance COP´s ??
Thanks for the info. This is a great forum ĦĦĦĦ
Also, has anyone tried the granatelly high performance COP´s ??
Thanks for the info. This is a great forum ĦĦĦĦ
TG
#4
I had the same issue after a long drive back up to Alaska from Vegas. I had the Ford dealership scan and they showed a couple of bad injectors, but it was actually plugs that were causing the misfire. I had 5 of 8 plugs gummed up. I had some pinging while towing, and I had to use octane booster, so one or the other, or the combination of both, probably caused the plugs to go bad so soon.
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#8
Definitely go with a smaller gap than stock.
Here's a good post for info on recommended plug gap:
https://www.f150online.com/forums/sh...spark+plug+gap
Here's a good post for info on recommended plug gap:
https://www.f150online.com/forums/sh...spark+plug+gap
#9
I think you can get them through lethal performance. They have a website, www.lethalperformance.com